[Olorin]

For the dual-class characters, you will only be offered the stronghold if the proper class is "active".

If you are a fighter-->mage that hasn't regained fighter status yet, Nalia will not offer the keep, but she would if your fighter levels were active.

Also, if you don't plan on using the various tricks to get multiple strongholds, you CAN choose which one to take. For example, if you had a fighter-->mage with both classes active and finished the Keep, but decided you'd rather get the mage stronghold, you can just refuse the Fighter one and get the Mage one later. The game does not check to see if you've been offered another stronghold, only whether you have accepted one.

P.S. there is a way to get multiple strongholds without any mods or tinkering with variables, but it doesn't work with all the strongholds (and the order you do things in matters). The previous paragraph should be enough of a hint to work out how.